基于TMCP工艺的FH36船板钢综合强化机理及疲劳裂纹扩展数值模拟  

Numerical Simulation on Comprehensive Strengthening Mechanism and Fatigue Crack Propagation of FH36 Ship Plate Steel by TMCP Process

作　　者：王孙中 彭兴东[1] 张鹏 刘磊 邢玉杰 WANG Sunzhong;PENG Xingdong;ZHANG Peng;LIU Lei;XING Yujie(School of Material and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China;State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan 114001,China)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [2]海洋装备用金属材料及其应用国家重点试验室,辽宁鞍山114001

出　　处：《热加工工艺》2024年第16期118-124,共7页Hot Working Technology

摘　　要：为了有效掌握高强度船板钢的综合强化机理和疲劳裂纹扩展行为,以控轧控冷工艺后的FH36钢为研究对象,利用EBSD、TEM和XRD等分析手段研究了FH36的沉淀相和织构成分;通过测试力学性能和疲劳裂纹扩展性能,定量计算了各强化机制对屈服强度的贡献值;采用新型扩展有限元法模拟了FH36船板钢的疲劳剩余寿命。结果表明:FH36钢中的沉淀相为NaCl型的(Ti,Nb)(C,N),主要的织构成分为{111}<123>、{331}<231>。综合强化机制的新算法可以定量表示为屈服强度的值等于固溶强化贡献值和沉淀强化值以及细晶强化与位错强化平方和的算术平方根值相加,其理论屈服强度值与实际屈服强度很好地符合。经试验验证,新型的数值分析结果的平均误差为3.02%,可以有效预测FH36钢的疲劳剩余寿命和评估疲劳性能。In order to effectively master the comprehensive strengthening mechanism and fatigue crack propagation behavior of high-strength ship plate steel,FH36 steel after controlled rolling and cooling process was taken as the research object.EBSD,TEM and XRD were used to study the precipitation phase and texture of FH36,and the mechanical properties and fatigue crack propagation performance were tested.The contribution of each strengthening mechanism to the yield strength was calculated quantitatively and the residual fatigue life of FH36 ship plate steel was simulated by a new extended finite element method.The results show that the precipitated phase in FH36 steel is NaCl type(Ti,Nb)(C,N),and the main texture is{111}<123>,{331}<231>.The new algorithm for synthesizing the strengthening mechanism can be expressed quantitatively as the yield strength value is equal to the solution strengthening contribution value and precipitation strengthening value,and the arithmetic square root value of the sum of the squares of fine grain strengthening and dislocation strengthening.The theoretical yield strength value is in good agreement with the actual yield strength.Compared with the experimental results,the average error of the new numerical analysis results is 3.02%,which can effectively predict the residual fatigue life and evaluate the fatigue properties of FH36 steel.

关 键 词：FH36钢 强化机理 疲劳裂纹扩展 数值分析 疲劳剩余寿命 

分 类 号：TG111.8[金属学及工艺—物理冶金] TG115.57[金属学及工艺—金属学]